Buttlord Wayne
I mean he was born from Fluttershy. Makes sense.
Late Riser caused quite a stir upon his birth. His poor stressed out parents were scared stiff when their precious newborn foal was utterly silent as he hung from the doctor’s hoof. Doctor Stable got a good look at the colt and he seemed to be breathing but otherwise wasn’t making a sound until the baby suddenly opened his little mouth wide and loosed a squeaky yawn. It was then he realized the problem, the foal was asleep and likely had been throughout the entire birth!